Multiple updates.

src/environments/environment.test.ts

@@ -200,7 +200,7 @@ export const environment: BuildConfig = {
     // The absolute lowest year to display in the dropdown (only used when no lowest date can be found for all items)
     defaultLowerLimit: 1900,
     // Whether to add item thumbnail images to BOTH browse and search result lists.
-    showItemThumbnails: true
+    showThumbnails: true
   },
 
   item: {